Environmental disturbance alters the ecological impact of an invading shrimp

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dc.contributor.author Candolin, Ulrika
dc.contributor.author Bertell, Elina
dc.contributor.author Kallio, Jarkko
dc.date.accessioned 2020-01-10T11:12:01Z
dc.date.available 2020-01-10T11:12:01Z
dc.date.issued 2018-05-05
dc.identifier.citation Candolin , U , Bertell , E & Kallio , J 2018 , ' Environmental disturbance alters the ecological impact of an invading shrimp ' , Functional Ecology , vol. 32 , no. 5 , pp. 1370-1378 . https://doi.org/10.1111/1365-2435.13078
dc.identifier.other PURE: 98676934
dc.identifier.other PURE UUID: 915df928-382a-4bd9-80b9-fa097a83d7c5
dc.identifier.other Scopus: 85043351482
dc.identifier.other WOS: 000431991700021
dc.identifier.other ORCID: /0000-0001-8736-7793/work/68614147
dc.identifier.uri http://hdl.handle.net/10138/309231
dc.description.abstract 1. Alien species are altering ecosystems around the globe. To predict and manage their impacts, the underlying mechanisms need to be understood. This is challenging in ecosystems undergoing multiple disturbances as unexpected interactions can alter the impact of individual disturbances. Such interactions are likely to be common in disturbed ecosystems, but have so far received little attention. 2. We investigated whether interactions between an invading shrimp Palaemon elegans and another human-induced disturbance, the population growth of a native mesopredator, the threespine stickleback, influences a third human-induced disturbance, the increase in biomass of filamentous algae. Increases in both the native mesopredator population and algal biomass have been promoted by eutrophication and a trophic cascade triggered by declining predatory fish stocks. 3. We used mesocosm and field enclosure experiments, combined with analyses of long-term trends in the abundance of the invader and the native mesopredator, to dissect the influence of the two species on algal biomass when alone and when co-occurring. 4. The impact of the invader on algal biomass depended on the native mesopredator; shrimp on their own had no effect on algal growth, but mitigated algae accumulation when competing with the stickleback for resources. Competition caused the shrimp to shift its diet from grazers to algae, and its habitat choice from open to vegetated habitats. The native mesopredator, in contrast, increased algal biomass irrespective of the presence of the invader, by preying on grazers and inducing a trophic cascade. 5. Our results show that the presence of a native mesopredator causes an invader to alter its behaviour and thereby its ecological impact. This demonstrates that interactions between invaders and other anthropogenic disturbances can alter the ecological impact of invaders, and, notably, that the impact of invaders can be positive and stabilize disturbed ecosystems. These results stress the importance of considering interactions among disturbances when investigating the ecological impact of alien species. en
dc.format.extent 9
dc.language.iso eng
dc.relation.ispartof Functional Ecology
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 1181 Ecology, evolutionary biology
dc.subject anthropogenic disturbance
dc.subject eutrophication
dc.subject food webs
dc.subject mesopredator release
dc.subject niche
dc.subject nonindigenous species
dc.subject Palaemon elegans
dc.subject species interactions
dc.subject BALTIC SEA
dc.subject PALAEMON-ADSPERSUS
dc.subject BIOLOGICAL INVASIONS
dc.subject TROPHIC POSITION
dc.subject PREDATORY FISH
dc.subject INVADERS
dc.subject ECOSYSTEM
dc.subject STICKLEBACKS
dc.subject ELEGANS
dc.subject REGIME
dc.title Environmental disturbance alters the ecological impact of an invading shrimp en
dc.type Article
dc.contributor.organization Biosciences
dc.contributor.organization Ecology and Evolutionary Biology
dc.contributor.organization Behavioural Ecology - Candolin Research Lab
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1111/1365-2435.13078
dc.relation.issn 0269-8463
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion

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